Des Plaines, Illinois, police investigate home sparking theories about serial killer
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Des Plaines Illinois Investigation via NBC Chicago
Des Plaines Illinois Investigation via NBC Chicago

Des Plaines, Illinois, police investigate the backyard of a home tied to an ‘old case,’ sparking theories about this notorious serial killer

A multi-day search of a home's backyard has prompted online speculation about potential ties to this infamous serial killer.

In late April 2025, Des Plaines, Illinois, became the center of public intrigue as local police conducted a multi-day investigation at a residence on the 100 block of N. Warrington Road. 

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With the Cook County Major Case Assistance Team, authorities described the operation involving backyard excavation as a “follow-up investigation” related to an “old case.” 

Despite the significant police presence and extensive search, officials emphasized that they were not searching for a body and that there was no threat to the public. 

Could it be Gacy?

@nbcchicago

Is this mysterious police investigation in Des Plaines connected to serial killer John Wayne Gacy, given his history in the area? Police say it’s tied to an old case, there’s no threat to the public, and no connection to Gacy. #desplaines #truecrime #johnwaynegacy

♬ original sound – NBC Chicago – NBC Chicago

In the meantime, the lack of specific information from law enforcement led to widespread speculation, particularly on social media platforms. Many users theorized a connection to John Wayne Gacy. Gacy was a notorious serial killer who was arrested in 1978 for the murders of 33 young men and boys. Gacy buried many of his victims beneath his home in unincorporated Norwood Park Township, near Des Plaines. 

Gacy’s crimes have left a lasting impact on the area. For this reason, any significant police activity tends to revive public interest and concern.

“It’s scary. How did they come to the conclusion it was this? They musta got some lead that brought them here,” Jeanette Sedano, who lives nearby, told ABC 7 Chicago.

“You see all this activity, the crime scene tape, bringing in equipment,” neighbor Irma Dzik added.

Reports emerged about the criminal history of a man who recently lived at the Warrington Road residence. Authorities have not confirmed any connection between this individual and the current investigation.

The Robert Piest disappearance

While the Des Plaines Police Department has not provided further details, the nature of the investigation nature and the location have inevitably drawn comparisons to a Gacy case. 

In 1978, the disappearance of 15-year-old Robert Piest led Des Plaines police to investigate Gacy. That investigation ultimately uncovered evidence that resulted in his arrest and the discovery of his numerous victims. 

Gacy’s former residence, which was demolished in 1979 is not the same property under investigation. A new home was built on the site in the 1980s

The recent investigation underscores the enduring legacy of Gacy’s crimes in Des Plaines and the public’s sensitivity to potential connections. 

As of now, authorities have not indicated any direct link between the current case and Gacy. For now, the community awaits further information to clarify the situation


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William Kennedy
William Kennedy is a full-time freelance content writer and journalist in Eugene, OR. William covered true crime, among other topics for Grunge.com. He also writes about live music for the Eugene Weekly, where his beat also includes arts and culture, food, and current events. He lives with his wife, daughter, and two cats who all politely accommodate his obsession with Doctor Who and The New Yorker.